JP4836770B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas-insulated switchgear having a plurality of diaphragms constructed by connecting three circuit breakers in series between a pair of main buses, and more particularly, a gas insulation of a 1/1/2 circuit breaker system. The present invention relates to a switchgear.

  In general, a gas-insulated switchgear is composed of a circuit breaker, disconnector, busbar, etc. that are configured by insulatingly arranging a high-voltage charging part in a sealed container that is filled with an insulating gas such as SF6 gas and grounded, and is safe and reliable. In recent years, it has been installed in various places because it has high performance and can greatly reduce the installation area. By the way, in the important system, a 1/1/2 circuit breaker type gas insulated switchgear is used, and a single-line connection diagram thereof is shown in FIG.

  Between the pair of main buses 1 and 2, three circuit breakers CB1, CB2, and CB3 each connected to a disconnector on both sides are connected, and although not shown, a current transformer and a ground switch are connected. Is done. The branch bus 5a is connected between the disconnector DS12 and the disconnector DS21, the branch bus 6a is connected between the disconnector DS22 and the disconnector DS31, and the ends of the branch buses 5a and 6a are insulated and led out by a cable head or bushing. A single diagram A is formed. Here, another diagram B is also formed between the main buses 1 and 2, and in the diagram A, the branch bus 5a is led out to the main bus 1 side, and the branch bus 6a is led out to the main bus 2 side. On the other hand, in this diagram B, the branch bus 5b is led out to the main bus 2 side and the branch bus 6b is led out to the main bus 1 side to balance the load.

  As shown in FIG. 8, the conventional gas insulated switchgear based on this single line connection diagram arranges main buses 1 and 2 approximately parallel to each other at a predetermined distance so as to correspond to the single line connection diagram. Three circuit breakers having disconnectors on both sides are arranged in the direction of bridging between them. The branch buses 5a and 5b and the branch buses 6a and 6b are connected between the disconnecting devices connected to both sides of each circuit breaker. In the diagram A, the branch bus 5a and the branch bus 6a are led out in opposite directions, while in the diagram B, the branch bus 5b and the branch bus 6b are led out in a crossing direction (for example, see Patent Document 1). reference).

  Patent Document 1 also shows an example in which one diagram derives in the direction of the branch bus and the other diagram derives in a direction intersecting the branch bus.

FIG. 12 of JP-A-11-355923

  However, in the conventional gas-insulated switchgear described above, in the case of having the diagram B that leads out in the direction intersecting the branch bus 5b and the branch bus 6b, three units are provided in the direction of bridging between the pair of main buses 1 and 2. Since the circuit breakers CB1 to CB3 are arranged, a large installation area is required in the direction of bridging between the main buses 1 and 2. Moreover, since the branch bus 5b is arranged between the diagrams A and B, a large installation area is required also in the axial direction of the main buses 1 and 2. In addition, consideration is not given to the dismantling and inspection work at the time of the accident occurrence of each of the circuit breakers CB1 to CB3, and if a work space is secured to achieve this, a gas insulated switchgear having a larger installation area is obtained. . Therefore, there is a concern that the circuit breaker to be dismantled and repaired must be lifted upward and transported after dismantling the main bus bar.

  An object of the present invention is to provide a gas-insulated switchgear that can secure a space for performing a disassembly inspection work when a circuit breaker accident occurs and can reduce the installation area.

  The present invention provides a plurality of diaphragms configured by connecting in series a breaker unit constituted by three breakers connected in series, substantially parallel to the longitudinal direction of the pair of main bus bars, and other adjacent ones. Consists of a connecting bus for connecting between disconnecting devices of the breaking unit, and a connecting bus for connecting an auxiliary bus with the disconnecting switch located at the end of the gas insulated switch, and connecting the connecting bus to the branch bus Part is formed between the three shut-off units, the branch bus is led out to the main bus side from the first connection part, and the lead-out direction extends from the second connection part across the shut-off unit. Is led out to the main bus side in the opposite direction, the axis of the hermetic container of the circuit breaker is located below the axis of the connection bus bar, and the disconnector is arranged on substantially the same axis as the connection bus bar. Connect the airtight container of the circuit breaker and the airtight container of the disconnector Te, there is provided a gas insulated switchgear which forms a space comprising at least one working space below said second connecting portion. In addition, it is preferable that the said work space has the length more than the length of the axial direction of the airtight container of an adjacent circuit breaker.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring the space which performs the disassembly inspection operation at the time of the accident occurrence of a circuit breaker, the gas insulated switchgear which enabled reduction of the installation area can be provided.

  A general configuration of a gas insulated switchgear according to the present invention will be described using reference numerals. That is, the gas-insulated switchgear according to the embodiment of the present invention is disposed between a pair of main buses (1, 2) arranged substantially parallel at a predetermined distance, and is substantially parallel to the longitudinal direction of the main bus. A plurality of diammeters (A, A, B) constituted by connecting in series a breaker unit composed of two breakers (3-5) and two disconnectors (6-11) arranged in series across the breaker (3-5) B), connecting busbar (28) for connecting between disconnectors of other adjacent breaking units, disconnector (6, 11) and auxiliary busbar (12) located at the end of the gas insulated switch Connecting buses (30, 31) to be connected.

  Two connecting portions between the connecting buses (28, 30) and the branch buses (14 to 17) are formed between the three blocking units, and the branch buses are connected to the main bus side from the first connecting portion. And is led out to the main bus side in a direction opposite to the lead-out direction from the second connecting portion across the blocking unit. The axis of the airtight container of the circuit breaker is positioned below the axis of the connection bus (28, 30), and the disconnector is arranged on substantially the same axis as the connection bus. The closed container of the circuit breaker and the closed container of the disconnector are connected to form a space serving as at least one work space (S1) below the second connection portion. The work space (S1) preferably has a length equal to or greater than the axial length of the closed container of the adjacent circuit breaker. In addition, although the length (S2) formed between the circuit breakers 4 and 5 is smaller than S1, it can become a working space.

  Furthermore, the end of the connecting bus of the plurality of diaphragms provides a gas insulated switchgear connected to the main bus by an auxiliary bus, and two breakers adjacent to the work space (S1) Are arranged so as to be able to be carried out in the work space.

  In the gas-insulated switchgear according to the present invention, the circuit breaker is disposed at a position lower than the main bus and the connection bus, and the disconnectors connected to both ends of the hermetic container of the circuit breaker are substantially the same as the connection bus and the main bus. Place at height. As a result, the branch bus of the second connection portion between the branch bus and the connection bus is derived so as to intersect with the connection bus of the other meter in the opposite direction to the branch bus in the first connection portion. And connected to the main bus. Since the working space is formed below the branch bus and the connecting bus, a sufficiently large space S1 (a size larger than the length of the circuit breaker sealed container) can be formed. Therefore, the disassembly work and the carry-out work of two of the three circuit breakers of the circuit breaker unit are easily performed by sharing the above work space without disassembling the main bus bar or lifting it upward. be able to. In addition, the circuit breaker which is not adjacent to the said work space can be pulled out and conveyed as it is.

  Moreover, since the upper part of the dismantling and inspection work space is used for the arrangement of the branch buses, a gas insulated switchgear that is reduced in the axial direction of the main buses can be obtained.

  In addition, both branch buses arranged in the upper part of the space for dismantling inspection work are connected to one main bus side in the case of a diagram arranged on one main bus side and one main bus in a diagram arranged on the other main bus side. Derived to the bus side. For this reason, the installation area can be reduced in the axial direction of the main bus bar even if the load is derived in different directions so as to balance the load of each branch bus.

  In a gas-insulated switchgear in which a plurality of diagrams having three circuit breakers connected in series are connected between a pair of main buses, and branch buses are connected between the circuit breakers of each of the diagrams, the main bus is They are arranged almost in parallel at a predetermined distance. The three circuit breakers that are located between the main bus lines and that constitute the diameter meter in the axial direction of the main bus line are arranged, and are arranged in parallel with the three circuit breakers of the diameter meter. The other diameter meter is configured. Both the diaphragms form a common disassembly inspection work space (S1) between two adjacent circuit breakers of the three circuit breakers. The branch buses of the two meteres are provided at positions shifted in the axial direction of the main bus bar above the dismantling and inspection work space.

  As mentioned above, since the necessary equipment will be placed in the rectangle (not including the square) partitioned by the main bus, the installation location of the gas insulated switchgear is more secure than the square installation location. It becomes easy.

  In the gas-insulated switchgear according to the present invention, the two diaphragms are connected between two adjacent circuit breakers (S1) among the three circuit breakers forming the dismantling inspection work space. It is made larger in the axial direction of the main bus bar than between the circuit breakers (S2).

  In addition, the two branch buses arranged in the upper part of the dismantling and inspection work space (S1) are arranged on one main bus side to balance the voltage, and the diagram arranged on the other main bus side is arranged on the other main bus side. In addition, each of the diagrams arranged on the other main bus side leads to one main bus side.

  Further, each of the two circuit breakers having the space for dismantling and inspection work branches upward on the opposite side of the circuit breaker hermetic container, and these branched portions are located above the space for dismantling and inspection work. It can be connected with the connected connecting bus.

  Further, each of the two circuit breakers having the space for dismantling and inspection work branches upward on the opposite side of the circuit breaker hermetic container, and these branched portions are located above the space for dismantling and inspection work. It is possible to connect with the connecting bus located, and to place the branch bus above the connecting bus.

  In the gas insulated switchgear according to the embodiment of the present invention, the three circuit breakers are arranged in the axial direction of the main bus to configure each of the diagrams, so that the two main buses are arranged closer to each other than before. The installation area can be reduced. Also, a common disassembly inspection work space is formed between two adjacent circuit breakers among the three circuit breakers. Since the branch buses of the two meters are respectively provided at positions shifted in the axial direction of the upper main bus bar of the dismantling inspection work space, the dismantling inspection work space formed between the two breakers is divided into two breakers. Can also be used in combination. Moreover, since the upper part of the dismantling and inspection work space is used for the arrangement of the branch buses, a gas insulated switchgear that is reduced in the axial direction of the main buses can be obtained.

  Moreover, in the said embodiment, between two adjacent circuit breakers 3 and 4 among the three circuit breakers 3, 4 and 5 which formed the space for dismantling inspection work, two other adjacent circuit breakers It is made larger in the axial direction of the main bus bar than between 4 and 5. As a result, the disassembly inspection work space S1 can also be used for the disassembly inspection work of the two circuit breakers 3 and 4, and can eventually be reduced in the arrangement direction of the three circuit breakers.

  In addition, both branch buses arranged in the upper part of the space for dismantling inspection work are connected to one main bus side on the one main bus side and one on the other main bus side. Derived to the main bus side. Therefore, the installation area can be reduced in the axial direction of the main bus even if each branch bus is derived in a different direction so as to balance the load.

  Further, in the above embodiment, the two breakers forming the dismantling inspection work space are branched upward on the opposite sides of the circuit breaker hermetic container, respectively, and these branched parts are located above the dismantling inspection work space. Connected with the connecting bus located at. Therefore, the axial end portion of the circuit breaker sealed container can be used for dismantling inspection work, and a sufficient dismantling inspection work space S1 can be formed below the connecting bus.

  Further, in the above embodiment, the two breakers forming the dismantling inspection work space are branched upward on the opposite sides of the circuit breaker hermetic container, respectively, and these branched parts are located above the dismantling inspection work space. Connected with the connecting bus located at. Therefore, the axial end portion of the circuit breaker sealed container can be used for disassembly inspection work, and a sufficient disassembly inspection work space can be formed below the connecting bus. In addition, because the branch bus is arranged above the connecting bus, a sufficient space for dismantling inspection work can be formed in the lower part of the connecting bus, and the dismantling inspection work space can also be used for the branch bus arrangement. Thus, the gas insulated switchgear can be reduced in the axial direction of the main bus.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 2 is a single line connection diagram corresponding to the plan view of the gas insulated switchgear according to the embodiment of the present invention.

  The main buses 1 and 2 are arranged substantially in parallel at a predetermined distance, and two diagrams A and B are formed in a space formed between the main buses 1 and 2. Diameter A closer to main bus 1 is configured by arranging three breakers 3, 4, and 5 on a virtual vertical plane passing through a center line substantially parallel to main bus 1 with a predetermined distance therebetween. . The disconnecting switch 6 with a ground switch connected to one side of the circuit breaker 3 is arranged so as to be substantially orthogonal to the main buses 1 and 2 and connected to the auxiliary bus 12 connected to the main bus 1, and to the other side of the circuit breaker 3. The connected disconnect switch with ground switch 7 is connected to the disconnect switch with ground switch 8 connected to one side of the circuit breaker 4. The disconnecting switch 9 with the earthing switch connected to the other side of the circuit breaker 4 is connected to the disconnecting switch 10 with the earthing switch connected to one side of the circuit breaker 5, and the disconnecting with the earthing switch connected to the other side of the circuit breaker 5. The vessel 11 is connected to the auxiliary bus 13 that is arranged so as to be substantially orthogonal to the main buses 1 and 2 and connected to the main bus 2. The diagram B also has the same configuration, and is electrically connected between the auxiliary bus 12 and the auxiliary bus 13 described above, and cuts off three units on a virtual vertical plane passing through a center line substantially parallel to the main buses 1 and 2. Similarly, the containers 3, 4, and 5 are arranged with a predetermined distance therebetween.

  A branch bus 14 is connected between the disconnecting switch 7 with the earthing switch of the circuit breaker 3 constituting the diagram A and the disconnecting switch 8 with the earthing switch of the circuit breaker 4 and led out to the main bus 2 side. A branch bus 15 is connected between the disconnector 9 with the grounding switch of the circuit breaker 4 and the disconnector 10 with the grounding switch of the circuit breaker 5 and led out to the main bus 1 side. Further, a branch bus 16 is connected between the disconnector 7 with the earthing switch of the circuit breaker 3 constituting the diagram B and the disconnector 8 with the earthing switch of the circuit breaker 4 and is led out to the main bus 1 side. A branch bus 16 is connected between the disconnecting switch 9 with the grounding switch 4 and the disconnecting switch 10 with the grounding switch 5 of the circuit breaker 5 and led out to the main bus 2 side. The derivation directions of the branch bus 14 and the branch bus 15 of the diagram A are opposite directions, and the derivation directions of the branch bus 16 and the branch bus 17 of the meter B are opposite directions. Furthermore, the load balance can be achieved by setting the branching bus 14 and the branching bus 15 of the diagram A to the reverse directions of the branching bus 16 and the branching bus 17 of the meter B, respectively.

  FIG. 3 is a front view of the gas insulated switchgear showing only one phase in the diagram A.

  The three circuit breakers 3 to 5 are respectively configured in cylindrical circuit breaker sealed containers 18 to 20. And the central axis of each airtight container 18-20 for each circuit breaker is arrange | positioned together on the same axis line substantially parallel to the main bus line 1, and it supports on the mount frame 21, respectively. The circuit breaker sealed containers 18 to 20 of the circuit breakers 3 to 5 each have one branch portion that branches upward at both ends thereof, and disconnectors 6 to 11 with ground switches are formed at the branch portions, respectively. Connect substantially horizontal disconnect containers 22-27. Between the circuit breaker airtight container 18 of the circuit breaker 3 and the circuit breaker airtight container 19 of the circuit breaker 4 adjacent thereto, a space used for alternately disassembling and checking the circuit breakers 3 and 4 is secured. To do. The disconnector sealed container 23 and the disconnector sealed container 24 corresponding to this space are connected by a connecting bus 28 arranged on the same axis.

  Similarly, between the circuit breaker airtight container 19 of the circuit breaker 4 and the circuit breaker airtight container 20 of the circuit breaker 5 adjacent thereto, a space for dismantling inspection work that can be used for disassembly inspection of the circuit breaker 5. Secure. The disconnector sealed container 25 and the disconnector sealed container 26 corresponding to the dismantling and inspection work space are connected by a connecting bus 29 arranged on the same axis.

  The disconnecting container 22 and the auxiliary bus 12 of the disconnecting switch 6 with the earthing switch are also connected by the connecting bus 30, and the connecting container 27 and the auxiliary bus 13 of the disconnecting switch 11 with the earthing switch are also connected. The connection buses 30 and 31 are also arranged on substantially the same central axis as the previous connection buses 28 and 29. As will be understood from FIG. 1 to be described later, the configuration centered on the circuit breakers 3 to 5 is configured on a virtual vertical plane passing through a center line substantially parallel to the main bus 1. As described above, the drawing shows only one phase, but since the three phases are actually juxtaposed, each phase is respectively on three virtual vertical planes passing through a center line substantially parallel to the main bus 1. It will be configured. The diagram B is also configured in the same manner as the diagram A shown in FIG. 3, and the three phases thereof are juxtaposed.

  Between the circuit breaker airtight container 18 of the circuit breaker 3 and the circuit breaker airtight container 19 of the circuit breaker 4, a disassembly inspection work space S1 used for alternately disassembling and inspecting the circuit breakers 3 and 4 is secured. The connecting bus 28 provided corresponding to the dismantling inspection work space is disposed on the central axis located above the central axis of the circuit breakers 3 to 5. Therefore, a space for dismantling and inspection work can be formed below the connection bus 28 without being obstructed by the connection bus 28. In addition, a disassembly inspection work space used for disassembling and checking the circuit breaker 5 is also secured between the circuit breaker sealed container 19 of the circuit breaker 4 and the circuit breaker sealed container 20 of the circuit breaker 5. Since the connection bus 29 provided corresponding to the dismantling inspection work space is arranged on the central axis located above the central axis of the circuit breakers 3 to 5, it is not obstructed by the connection bus 29. A space for dismantling inspection work can be formed below the connecting bus bar 29.

The circuit breaker 5 performs disassembly inspection work using the space for disassembly inspection work formed in the lower part of the connection bus 29, but for a new disassembly inspection work using the lower part of the connection bus 31 in the circuit breaker 5. If a space is formed, the circuit breakers 4 and 5 can be arranged closer to each other.
Further, a space for dismantling and inspection work used for alternately disassembling the circuit breakers 4 and 5 between the circuit breaker sealed container 19 of the circuit breaker 4 and the circuit breaker sealed container 20 of the circuit breaker 5 is secured, and the circuit breaker 3 Can also use the lower portion of the connecting bus 30 to form a dedicated space for dismantling and inspection work. Therefore, in the 1/1/2 circuit breaker system using three circuit breakers 3-5, a common dismantling inspection work space is secured between any two adjacent circuit breakers among the three circuit breakers 3-5. You just have to do it.

  The branch buses 14 and 15 are arranged in the upper part of the dismantling inspection work space necessary for the dismantling inspection work of the circuit breakers 3 to 5. In the case of illustration, the common bus for dismantling and inspection formed between two adjacent circuit breakers 3 and 4 is further utilized to dispose the branch bus 14 in the upper part of the same portion, and the dismantling and inspection work of the circuit breaker 5 is performed. The branch bus 15 is arranged in the upper part of the same part by further utilizing the work space. Therefore, even if the three breakers 3 to 5 are arranged in the axial direction of the main buses 1 and 2, since the disassembly inspection work space and the arrangement of the branch buses 14 and 15 are combined, The installation area can be reduced.

  FIG. 1 is a plan view showing a gas insulated switchgear according to an embodiment of the present invention. FIG. 1 shows a gas-insulated switchgear in the case of having two diagrams A and B corresponding to the connection diagram of FIG. Here, in the diagram A and the diagram B, the direction of bridging between the main buses 1 and 2 is set as the juxtaposition direction, and three circuit breakers 3 to 5 for three phases are respectively connected to the axes of the main buses 1 and 2. Arrange along the direction. Therefore, a disassembly inspection work space for alternately disassembling and checking the circuit breakers 3 and 4 is intensively formed between the circuit breakers 3 and circuit breakers 4 of the diagrams A and B as described above. Further, as described above, the disassembly inspection work space S2 for disassembling and inspecting the circuit breaker 5 is intensively formed between the circuit breakers 4 and the circuit breakers 5 of the diagrams A and B. Branch buses 14 and 16 are arranged in a direction substantially orthogonal to the main buses 1 and 2 in the upper portion of the dismantling and inspection work space formed intensively using the breakers 3 and 4. Further, branch buses 15 and 17 are arranged in a direction substantially perpendicular to the main buses 1 and 2 in the upper part of the dismantling and inspection work space formed intensively using the breakers 4 and 5, respectively. The branch bus 14 leads to the main bus 2 side, the branch bus 16 leads to the main bus 1 side, the branch bus 15 leads to the main bus 1 side, and the branch bus 17 leads to the main bus 2 side.

  FIG. 4 is a cross-sectional view taken along the line XX of FIG. 1, in which the circuit breakers 3 for the three phases of the diagrams A and B are juxtaposed and connected to the upper part of the circuit breaker 3 of the diagram A A branching bus 14 extending in a direction of bridging the main buses 1 and 2 is connected to the airtight container 23 of the switch breaker 7 with a switch at the upper part of each circuit breaker 3. In the middle of the branch bus 14, an instrument transformer (VT) 33 and the like are connected via a disconnector 32 as shown in the single line connection diagram of FIG. 2, but these are omitted depending on the circuit configuration. Sometimes.

  In such a gas insulated switchgear, the space formed for the dismantling inspection of the circuit breakers 3 to 5 is further utilized, and the branch buses 14 to 17 are arranged in the same portion. In the case of illustration, the branch bus | baths 14 and 16 for three phases are arrange | positioned in the same part further utilizing the common space for dismantling inspection work formed between two adjacent circuit breakers 3 and 4. FIG. Since the three-phase branch buses 15 and 17 are arranged in the same part by further utilizing the space for dismantling and inspection work of the circuit breaker 5, three circuit breakers 3 to 5 are arranged in the axial direction of the main buses 1 and 2. Even if it arrange | positions, disassembly inspection work space and arrangement | positioning of the branch buses 14-17 can be combined. As a result, the installation area in the circuit breaker juxtaposition direction can be reduced.

  In particular, a space for dismantling inspection work is formed between each of the circuit breakers 3 to 5 for dismantling inspection, but this is an essential space, and this dismantling inspection work space is further utilized. Thus, the branch buses 14 and 16 are arranged in the upper part of the same part that does not interfere with the dismantling inspection work. In other words, the common disassembly inspection work space formed between the two adjacent circuit breakers 3 and 4 is further utilized to cross the insulation leading direction in order to balance the voltage in the upper part of the same part, The branch buses 14 and 16 connected to the connecting conductor or the connecting bus 28 are arranged at positions shifted in the axial direction of the buses 1 and 2. Therefore, even if the three circuit breakers 3 to 5 are arranged in the axial direction of the main buses 1 and 2, since the space for dismantling inspection work and the arrangement of the branch buses 14 and 16 are combined, they are simply used for dismantling inspection work. As compared with the case where the space is secured, the installation area in the circuit breaker juxtaposition direction can be reduced.

  Further, in the 11/2 circuit breaker system, since the three circuit breakers 3 to 5 are arranged on substantially the same central axis, a certain installation area must be secured in this axial direction. In the conventional case, as shown in FIG. 8, three circuit breakers 3 to 5 are arranged on the central axis that bridges between the main buses 1 and 2. Since three phases or a plurality of diagram meters A and B are arranged in the central axial direction of the main buses 1 and 2, a large installation area is required both in the bridging direction and in the axial direction of the main buses 1 and 2. However, in the gas insulated switchgear according to this embodiment described above, three circuit breakers 3 to 5 are arranged in the axial direction of the main buses 1 and 2. And in order to arrange the three-phase portion or the plurality of diagrams A and B in the direction of bridging between the main buses 1 and 2, in particular, the facing direction of the main buses 1 and 2 can be reduced, and the installation area can be reduced. It can be a small gas insulated switchgear.

  In the gas-insulated switchgear described above, the branch buses 14 and 17 shown in FIG. 1 are led out through the respective cable heads and then connected to the respective cables, while the branch buses 15 and 16 are passed through the respective bushings. Insulation is led out and then connected to each power transmission line, for example. The insulation on the cable side is held by the covering, whereas each bushing side needs to secure a relatively large air insulation distance. For this reason, the connection positions of the connection buses 28 and 29 and the branch buses 14 to 17 can be performed at various positions in the axial direction of the connection buses 28 and 29 in consideration of the air insulation distance between the bushings. it can. For example, if the axial positions of the main buses 1 and 2 are interchanged between the branch bus 14 and the branch bus 16, between the three-phase bushing connected to the branch bus 16 and the three-phase bushing connected to the branch bus 15 A sufficient insulation distance can be easily secured.

  Further, in the gas insulated switchgear shown in FIG. 1, the axial length of the connecting bus 28 that connects between the disconnecting switch with grounding switch 7 and the disconnecting switch with grounding switch 8 is the same between the branch bus 14 and the branch bus 16. It is almost determined by the arrangement. Therefore, the space for dismantling and inspection work formed between the circuit breaker 3 and the circuit breaker 4 is slightly increased. However, either one of the branch buses 14 and 16 is disposed above the connection bus 28 and the other is disposed below the connection bus 28, and the three-phase portion of the branch bus 16 is between the bushings as described above. In consideration of the air insulation distance, a larger interphase spacing than that shown in the drawing is secured in advance. Thereby, the branch buses 14 and 16 can be shifted in the axial direction of the main buses 1 and 2. Furthermore, it can be effectively utilized while shortening the axial length of the connecting bus 28 in accordance with the necessary space for dismantling inspection work between the circuit breaker 3 and the circuit breaker 4.

  However, in this case, the branch bus 14 or the branch bus 16 disposed below the connection bus 28 needs to be held at a height that does not hinder dismantling inspection work of the circuit breaker 3 and the circuit breaker 4. Furthermore, from such a concept, both the branch buses 14 and 16 can be arranged below the connection bus 28 at a height that does not hinder the disassembly and inspection work of the circuit breaker 3 and the circuit breaker 4. Further, the branch buses 14 and 16 can be shifted in the axial direction of the main buses 1 and 2 so that the phases of the branch bus 14 are interleaved between the phases of the branch bus 16 having a slightly expanded space between the three phases.

  Further, the branch buses 15 and 17 can be dispersedly arranged above and below the connecting bus 29 under the same conditions, or can be arranged below them. In particular, since the disassembly inspection work of the circuit breaker 5 can be performed from the auxiliary bus 13 side, it is not always necessary to secure a space for disassembly inspection work between the circuit breakers 4 and 5. The lower space may be used for the arrangement of the branch buses 15 and 17.

  FIG. 5 is a single line connection diagram corresponding to a plan view of a gas insulated switchgear according to another embodiment of the present invention.

  In this embodiment, diagrams C and D are further added to the single-line diagram of FIG. 1, and the equivalents to those shown in FIG. The main buses 1 and 2 are arranged substantially in parallel with a predetermined facing distance, and three breakers 3 to 5 of the diagram A partially shown in the axial direction of the main buses 1 and 2 are arranged, One end side of the three circuit breakers 3 to 5 is connected to the main bus 1 by the auxiliary bus 12, and the three circuit breakers 3 to 5 of the diagram B are arranged in parallel therewith. As in the previous case, the branch bus 14 connected between the circuit breaker 3 and the circuit breaker 4 of the diagram A is led out to the main bus 1 side, and the branch bus connected between the circuit breaker 3 and the circuit breaker 4 of the diagram B 16 is derived to the main bus 1 side.

  The newly added diagram meter C has three circuit breakers 3 to 5 arranged in the same direction so as to be adjacent to the circuit breaker 3 of the diagram A, and one end thereof is connected to the main bus 1 by the auxiliary bus 34. The other ends are connected to the main bus 2 by the auxiliary bus 35. In addition, the newly added diagram meter C is arranged in parallel with the diagram C, and the three circuit breakers 3 to 5 are arranged in the same manner, one end thereof is connected to the main bus line 1 by the auxiliary bus 34, and the other end thereof is connected. Are connected to the main bus 2 by the auxiliary bus 35. The branch bus 36 connected between the circuit breaker 3 and the circuit breaker 4 of the diagram C is led out to the main bus 1 side, and the branch bus 37 connected between the circuit breaker 4 and the circuit breaker 5 is led out to the main bus 1 side. ing. The branch bus 38 connected between the circuit breaker 3 and the circuit breaker 4 of the diagram D is led out to the main bus 1 side, and the branch bus 39 connected between the circuit breaker 4 and the circuit breaker 5 is led out to the main bus 2 side. ing.

  FIG. 6 is a plan view of the gas insulated switchgear configured based on the single-line connection diagram shown in FIG.

  The main buses 1 and 2 are arranged substantially in parallel with a predetermined distance from each other. The main buses 1 and 2 constitute the meter A and the meter B shown in FIG. Connected to main bus 1. As described above, a disassembly inspection work space for each is formed between the circuit breaker 3 and the circuit breaker 4. In addition, since the lower part of the auxiliary bus 12 is not used as a space for dismantling and inspection work for the circuit breaker 3, one end of the diameter C and the diameter D newly added to the same part is connected to the main bus 2. An auxiliary bus 35 is arranged. By arranging the auxiliary bus 12 and the auxiliary bus 35 vertically, the main buses 1 and 2 are reduced in the axial direction. Since the branch buses 14 and 16 are provided at a height that does not hinder the dismantling inspection work by utilizing the space for dismantling inspection work formed between the circuit breaker 3 and the circuit breaker 4, As in the case, the gas insulated switchgear is further reduced in the axial direction of the main buses 1 and 2 by effectively utilizing the space.

  The newly added diagram meter C has three circuit breakers 3 to 5 for three phases arranged on substantially the same axis as the circuit breakers 3 to 5 of the diagram A, and one end of the circuit breaker 3 is mainly connected to the auxiliary bus 35. Connected to the bus 2, the other end thereof is connected to the main bus 1 by the auxiliary bus 34. In addition, the newly added diagram D is arranged in parallel with the diagram C, and three circuit breakers 3 to 5 for three phases are arranged in the same manner, and one end thereof is connected to the main bus 2 by the auxiliary bus 35, The other ends thereof are connected to the main bus 1 by auxiliary buses 34. Diameter C and Diameter D secure a disassembly inspection work space for the circuit breaker 5 between the circuit breaker 4 and the circuit breaker 5, and disassembly inspection work of the circuit breaker 5 above the disassembly inspection work space. The branch bus 37 and the branch bus 39 are provided at a height where there is no hindrance, and are led out in different directions. This is the same as the configuration between the circuit breaker 4 and circuit breaker 5 of the diagrams A and B in the previous embodiment.

  Further, a intensive dismantling inspection work space for the circuit breakers 3 and 4 is formed between the circuit breaker 3 and the circuit breaker 4 in the diagrams C and D, and the circuit breaker is located above the dismantling and inspection work space. A branch bus 36 and a branch bus 38 are provided at heights that do not hinder the disassembly and inspection work of 3 and 4. This is substantially the same as the configuration of the circuit breakers 3 and 4 of the diagrams A and B in the previous embodiment, and the configuration of the branch buses 14 and 16 is also substantially the same except for the derivation direction. Here again, since the branch bus 36 and the branch bus 38 are provided by using the space for dismantling inspection work formed between the circuit breaker 3 and the circuit breaker 4, the gas insulated opening / closing reduced in the axial direction of the main buses 1 and 2 It can be a device.

  Also in this embodiment, the main buses 1 and 2 are arranged substantially in parallel with a predetermined interval, and three circuit breakers 3 to 5 are arranged in the axial direction of the main buses 1 and 2. In the case of having a plurality of diagrams, since at least one is juxtaposed in a direction bridging between the main buses 1 and 2, a gas insulated switchgear having a small installation area in the width direction between the main buses 1 and 2 can be obtained. it can. In addition, in order to secure a common disassembly inspection work space (S1) between the circuit breakers 3 and 4 and to equalize the voltage at a position where there is no hindrance to the disassembly inspection work above the disassembly inspection work space, Branch buses 14 and 16 or branch buses 36 and 38 that are not in opposite directions are arranged. Therefore, the branch buses can be arranged while utilizing the space for dismantling and inspection work, so that the gas insulated switchgear reduced in the axial direction of the main buses 1 and 2 can be obtained.

  Moreover, in this embodiment, when two diagrams A and B are juxtaposed in the direction of bridging between the main buses 1 and 2, and when more diagrams C and D are provided, It is arranged at a position shifted in the axial direction. Therefore, the dismantling and inspection work space formed between the breaker 3 and the breaker 4 in the axial direction of the main buses 1 and 2 and the branch buses 14 and 16 or the dismantling and inspection work formed between the breaker 3 and the breaker 4 Space and branch buses 36 and 38 can be balanced. Therefore, both can be effectively configured in the same part, and a gas insulated switchgear that is reduced in the axial direction of the main buses 1 and 2 can be obtained.

  In other words, it is conceivable to arrange three or more diagrams in the direction of bridging between the main buses 1 and 2, but in this case, three branch buses are respectively arranged between the circuit breaker 3 and the circuit breaker 4. It will be. Therefore, the balance between the dismantling inspection work space and the branch buses 36 and 38 in the same section is lost, and the space between the circuit breaker 3 and the circuit breaker 4 must be made larger than necessary for deriving the three branch buses. Eventually, the gas insulated switchgear becomes slightly larger in the axial direction of the main buses 1 and 2.

  Further, in each of the above-described embodiments, the branch buses 15 and 17 or the branch buses 37 and 39 derived from between the circuit breaker 4 and the circuit breaker 5 are derived in opposite directions, so that the circuit breaker 4 and the circuit breaker 5 are separated. The space between them is getting smaller. In order to equalize the voltage of the branch buses 15 and 17 or the branch buses 37 and 39, for example, when they are derived so as to cross each other, the circuit between the circuit breaker 4 and the circuit breaker 5 in this portion is connected to the circuit breakers 4 and 5. A common dismantling inspection space can be provided.

  Further, in each of the above-described embodiments, the three circuit breakers 3 to 5 are not equally spaced, but are larger between the circuit breaker 3 and the circuit breaker 4 than between the circuit breaker 4 and the circuit breaker 5. It is possible to form a dismantling inspection work space that is used for both in the part. Using this disassembly inspection work space, the branch buses 14 and 16 or the branch buses 36 and 38 can be provided at positions shifted in the axial direction of the main buses 1 and 2. Therefore, the gas insulated switchgear can be reduced in the arrangement direction of the three circuit breakers 3 to 5, that is, in the axial direction of the main buses 1 and 2.

  In the above-described embodiment of the present invention, the configuration in which the disconnecting switches 6-11 with the ground switch are used on both sides of each of the circuit breakers 3-5 has been described. The present invention can also be applied to gas-insulated switchgears having other configurations, such as those composed of a switch and a disconnector.

1 is a plan view of a gas insulated switchgear according to an embodiment of the present invention. FIG. 2 is a single line connection diagram corresponding to the gas insulated switchgear shown in FIG. 1. It is a front view which shows the outline of the gas insulated switchgear shown in FIG. It is a side view along the XX line of the gas insulated switchgear shown in Drawing 1. It is a top view of the gas insulated switchgear by other embodiments of the present invention. It is a single phase connection diagram of the gas insulated switchgear shown in FIG. It is a top view of the conventional gas insulation switchgear. It is a single wire connection diagram corresponding to the gas insulated switchgear shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Main bus, 3-5 ... Circuit breaker, 6-11 ... Disconnector with earthing switch, 12, 13 ... Auxiliary bus, 14-17, 36-39 ... Branch bus, A, B, C, D DESCRIPTION OF SYMBOLS ... Diameter, 18-20 ... Airtight container for circuit breakers, 21 ... Mount, 22-27 ... Airtight container for disconnectors, 28, 30, 31 ... Bus for connection, 12, 13, 34, 35 ... Auxiliary bus.

Claims (3)

Arranged between a pair of main busbars arranged substantially in parallel at a predetermined distance,
A plurality of diaphragms configured by connecting in series a breaker unit composed of one breaker and two breakers arranged in series with the breaker substantially parallel to the longitudinal direction of the main bus; ,
A connecting bus for connecting between disconnectors of other adjacent breaking units;
It consists of a disconnecting switch located at the end of the gas insulated switch and a connecting bus connecting the auxiliary bus,
Two connecting portions between the connecting bus and the branch bus are formed between the three interrupting units, the branch bus is led out to the main bus from the first connecting portion, and from the second connecting portion. Is crossed over the blocking unit and led out to the main bus side in the direction opposite to the leading direction,
The axis of the hermetic container of the circuit breaker is located below the axis of the connecting bus bar, the disconnector is arranged on substantially the same axis as the connecting bus bar, and the hermetic container of the circuit breaker and the hermetic seal of the disconnector are sealed Connecting the containers, forming a space to be at least one working space below the second connecting portion;
The gas insulated switchgear characterized in that the work space has a length equal to or longer than the axial length of the airtight container of an adjacent circuit breaker.   2. The gas insulated switchgear according to claim 1, wherein an end of a connecting bus of the plurality of diaphragms is connected to the main bus by an auxiliary bus.   2. The gas insulated switchgear according to claim 1, wherein two circuit breakers adjacent to the work space are arranged so as to be able to be carried out in the work space.

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